Mixing pipette



Jan. 4, 1938. w, JUFFA MIXING PIPET'IE Filed Jan. 21, 1936 Al/L HELM JUFFA /z fittorneys Patented Jan. 4, 1938 UNITED STATES PATENT OFFICE Application January 21, 1936, Serial No. 60,093 In Germany January 28, 1935 3 Claims.

This invention relates to a. mixing pipette such as employed particularly for b1ood analyses. 'I'hese pipettes have an upper and a lower capil- 1ary tube wth a mixing chamber, the so-called 5 mixng ampulla, between the two. One or more movable bodies are accommodated in this chamber in known manner.

The known movable bodies are solid. Consequently, the objecton arises that the movable body or f there are several, one of the movable bodies lodges in the mouth of the capillary tube of the instrument and more or less closes the same.

This objection is overcome by the invention as the passage or passages in the movable body ensure that the mouth of the tube remains open.

Consequently, according to the invention (me 15 net confined as regards size and shape of the movable body Which can be made in the most pra.ctcal shape. I-Iowever, the passage accordng to the invention produces an entrely novel effect When the instrument is shaken, for examp1e for mixng and intermixing the liquid to be analyzed and the analyzing lquid in that the liquids to be mixed can flow back through the passage or passages of the movable body or bodies. By these nove1 flowing conditons and difierent kinds of eddy formation during the to and fro movement of the movable bodies a more intimate and more uniform mixing of the liquide takes place in the mixing ampulla. This results in a much more accurate measuring durng the subsequent analyzing. Mixing pipettes of ths type serve chiefly for analyzing the human blood and for ascertaining the presence of serous nfectous diseases. As according to the inventon the liquds no longer flow, es heretofore, exclusively around the outer surface of the shakng body or bodies but also through the passages, a more intimate and thorough mixng of the liquids s obtained.

An embodiment of the nventon is illustrated by way of example in the accompanying drawing in which:--

Fig. 1 shows the mixing pipstte in elevaton.

Fig. 2 shows in perspective view a movable body on considerably enlarged scale. 7

The mixing pipette consists in known manner of an upper capillary tube I and a lower capillary tube 2 whch tubes serve for drawing in the liquid to be tested and admitting the testing liquid. A mxng ampulla 3 is arranged between the two tubes I and 2 and accommodates one or more movable bodies.

Accordng to the nvention the mo-vable body has one or more passages 4. These passages first prevent the shaking element or the movable body from stopping the capllary tubes. Secondly they enable the shaking element, independently of the mouth of the capillary tubes, to be made of any desred shape suitable for interwhirling the liquids and for ths reason alo-ne the passage improves the inter-mixing of the liquds and ensures a thorough intermixing even when the nstrument is only slightly shaken. in the movable body produce absolutely novel conditions of fiow and allow, as mentioned above, the return flow of the liquids thereby further imp-roving the mxing effect.

The movable body may be of any desired shape. However, the form of construction shown in Fig. 2 has been found particularly sutable.

I claim:-

1. A mixng pipette' especally a blood mxing pipette, comprising an upper capillary tube, a U

Thrdly the passages d 

